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Application of Weibull Parameter Estimation Methods for Fatigue Evaluation of Composite Materials Scatter

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Abstract

Rotorcraft composite structures are required to satisfy desired reliability levels when analyzing the scatter of material properties at coupon and element levels in accordance with the Federal Aviation Regulations “FAR 29.573” and the Advisory Circular “AC 29.573”. By estimating the strength and life shape parameters from static and fatigue test results, load enhancement factors can be obtained. Thus, the uncertainties from the scatter of composite properties can be analyzed. However, depending on the Weibull parameter estimation and scatter analysis methods, the load enhancement factors may differ. Therefore, in this paper, improved Weibull parameter estimation and scatter analysis methods have been proposed. Baseline static and fatigue tests are conducted, and the test data are pooled to generate reliable shape parameters. The static-strength shape and fatigue-life shape parameters are evaluated for eight Weibull parameter estimation and three scatter analysis methods. Moreover, based on the strategies of the Weibull parameter estimation and scatter analysis methods, the load enhancement factors are evaluated as a function of test duration. Finally, the consequences of model selection on distribution fitting and the scatter analysis along with the effect of life factors and strength parameters on the load enhancement factors are discussed. As a result, more conservative load enhancement factors are obtained by applying various Weibull parameter estimation methods for the scatter analysis.

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Acknowledgements

This work was supported by Korea Agency for Infrastructure Technology Advancement (KAIA) and grant was funded by the Ministry of Land, Infrastructure and Transport (19CHTR-C128889-03).

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Authors and Affiliations

  1. Department of Mechanical and Aerospace Engineering, Institute of Advanced Aerospace Technology, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea

    Changbae Lee, Duhyun Gong & SangJoon Shin

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  1. Changbae Lee
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  2. Duhyun Gong
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  3. SangJoon Shin
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Correspondence to SangJoon Shin.

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Lee, C., Gong, D. & Shin, S. Application of Weibull Parameter Estimation Methods for Fatigue Evaluation of Composite Materials Scatter. Int. J. Aeronaut. Space Sci. 22, 318–327 (2021). https://doi.org/10.1007/s42405-020-00309-z

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  • DOI: https://doi.org/10.1007/s42405-020-00309-z

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